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<head><meta charset="utf-8"><title>Perf server cpu features · t-infra · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/index.html">t-infra</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html">Perf server cpu features</a></h3>

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<a name="234938461"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234938461" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234938461">(Apr 17 2021 at 00:12)</a>:</h4>
<p>Does the rustc-perf server have avx available?</p>



<a name="234938501"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234938501" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234938501">(Apr 17 2021 at 00:12)</a>:</h4>
<p>specifically, the Rust <code>avx2</code> feature</p>



<a name="234938735"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234938735" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234938735">(Apr 17 2021 at 00:16)</a>:</h4>
<p>I believe it runs a 2000-series ryzen if it hasn't changed since the time eddyb was doing their reproducible perf counters work, so yes, it most likely supports avx2</p>



<a name="234939187"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939187" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939187">(Apr 17 2021 at 00:23)</a>:</h4>
<p>I think it's 3600</p>



<a name="234939189"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939189" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939189">(Apr 17 2021 at 00:23)</a>:</h4>
<p>so should</p>



<a name="234939271"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939271" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939271">(Apr 17 2021 at 00:24)</a>:</h4>
<p>can confirm</p>



<a name="234939274"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939274" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939274">(Apr 17 2021 at 00:24)</a>:</h4>
<p><span class="user-mention" data-user-id="125294">@Aaron Hill</span> ^</p>



<a name="234939287"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939287" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939287">(Apr 17 2021 at 00:24)</a>:</h4>
<p>CI won't build with that by default though</p>



<a name="234939295"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939295" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939295">(Apr 17 2021 at 00:25)</a>:</h4>
<p>i.e. <code>@bors try</code>?</p>



<a name="234939311"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939311" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939311">(Apr 17 2021 at 00:25)</a>:</h4>
<p>yeah</p>



<a name="234939320"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939320" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939320">(Apr 17 2021 at 00:25)</a>:</h4>
<p>what files do I need to modify to enable that?</p>



<a name="234939322"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939322" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939322">(Apr 17 2021 at 00:25)</a>:</h4>
<p>you can enable it if you need to, though, with some hacks, CI itself should run on recent enough cpus I suspect</p>



<a name="234939336"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939336" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939336">(Apr 17 2021 at 00:26)</a>:</h4>
<p>let me generate a patch or so</p>



<a name="234939378"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939378" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939378">(Apr 17 2021 at 00:26)</a>:</h4>
<p>thanks</p>



<a name="234939408"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939408" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939408">(Apr 17 2021 at 00:26)</a>:</h4>
<p>you need it for the compiler itself?</p>



<a name="234939419"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939419" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939419">(Apr 17 2021 at 00:26)</a>:</h4>
<p>yeah</p>



<a name="234939429"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939429" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939429">(Apr 17 2021 at 00:27)</a>:</h4>
<p>I'm experimenting with using HighwayHash for StableHasher</p>



<a name="234939439"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939439" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939439">(Apr 17 2021 at 00:27)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/blob/b0c818c5e0fa37251d9fda2f656bf1041a2e1e1d/src/bootstrap/builder.rs#L923">https://github.com/rust-lang/rust/blob/b0c818c5e0fa37251d9fda2f656bf1041a2e1e1d/src/bootstrap/builder.rs#L923</a></p>



<a name="234939446"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939446" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939446">(Apr 17 2021 at 00:27)</a>:</h4>
<p>the initial perf run showed it to be a performance loss</p>



<a name="234939449"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939449" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939449">(Apr 17 2021 at 00:27)</a>:</h4>
<p>something like that but w/o a arg(..)</p>



<a name="234939456"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939456" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939456">(Apr 17 2021 at 00:27)</a>:</h4>
<p>but I realied that it might not have been using the avx2 impl</p>



<a name="234939523"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939523" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939523">(Apr 17 2021 at 00:28)</a>:</h4>
<p>er, without the if</p>



<a name="234939525"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939525" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939525">(Apr 17 2021 at 00:28)</a>:</h4>
<p>sorry multtasking</p>



<a name="234939538"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939538" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939538">(Apr 17 2021 at 00:28)</a>:</h4>
<p>wait - will this affect <code>is_x86_feature_detected</code>?</p>



<a name="234939543"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939543" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939543">(Apr 17 2021 at 00:28)</a>:</h4>
<p>hm, isn't that runtime?</p>



<a name="234939547"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939547" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939547">(Apr 17 2021 at 00:29)</a>:</h4>
<p>yeah, that's what I thought</p>



<a name="234939556"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939556" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939556">(Apr 17 2021 at 00:29)</a>:</h4>
<p>runtime should be fine regardless</p>



<a name="234939561"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939561" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939561">(Apr 17 2021 at 00:29)</a>:</h4>
<p>so, maybe highwayhash is just slower for our inputs</p>



<a name="234939567"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939567" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939567">(Apr 17 2021 at 00:29)</a>:</h4>
<p>yeah maybe</p>



<a name="234939601"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939601" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939601">(Apr 17 2021 at 00:29)</a>:</h4>
<p>the google readme claimed that it was faster than SipHash 'for all input sizes'</p>



<a name="234939637"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939637" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939637">(Apr 17 2021 at 00:30)</a>:</h4>
<p>but it looks like we're using an implementation of SipHash128</p>



<a name="234939662"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939662" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939662">(Apr 17 2021 at 00:30)</a>:</h4>
<p>with a bunch of performance optimizations</p>



<a name="234939722"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939722" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939722">(Apr 17 2021 at 00:31)</a>:</h4>
<p>yeah, if it's a trivial impl of highwayhash I'd suspect a lot of work has gone into our siphash impl</p>



<a name="234939796"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939796" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939796">(Apr 17 2021 at 00:32)</a>:</h4>
<p>the crate I'm using had an avx2-based implementation, but I guess our siphash impl beats that for our use-case</p>



<a name="234939799"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939799" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939799">(Apr 17 2021 at 00:32)</a>:</h4>
<p>oh well</p>



<a name="234939844"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939844" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Aaron Hill <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939844">(Apr 17 2021 at 00:33)</a>:</h4>
<p>I was hoping for an easy way of reducing the impact of <a href="https://github.com/rust-lang/rust/pull/84227">https://github.com/rust-lang/rust/pull/84227</a>, but this doesn't look like it</p>



<a name="234939860"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939860" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939860">(Apr 17 2021 at 00:34)</a>:</h4>
<p>yeah as I said, fwiw, I think it should be acceptable to land</p>



<a name="234939893"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/234939893" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#234939893">(Apr 17 2021 at 00:34)</a>:</h4>
<p>not great, but not the worst thing</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/235048784" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Josh Triplett <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#235048784">(Apr 18 2021 at 06:30)</a>:</h4>
<p><span class="user-mention" data-user-id="125294">@Aaron Hill</span> Have you benchmarked xxhash?</p>



<a name="235048808"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/242791-t-infra/topic/Perf%20server%20cpu%20features/near/235048808" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Josh Triplett <a href="https://rust-lang.github.io/zulip_archive/stream/242791-t-infra/topic/Perf.20server.20cpu.20features.html#235048808">(Apr 18 2021 at 06:31)</a>:</h4>
<p>There's also another one I'm trying to think of that has extensive CPU optimizations.</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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